It's probably not the way you wanted me to interpret your answer, but looking at it from another view one area where there appears to be a lot of success is the market hall type concept whereby food vendors set up in a shared building with a common food court seating area. So yes, in a way, it is ending up like a department store, with a lot of smaller concessions within a large building.
TGI's was nothing special, and in any market where there isn't a distinction for quality, service or price, they are under threat. None of my TGI's experiences have left me with, let's go there again out of choice it was usually an event, birthday, leaving etc.
The takeaway apps have just made people more lazier, as is demonstrated by some of the examples in this thread. But then again, if there's someone who wants pay a fiver to have a soggy lukewarm burger delivered in a bag, so be it.